Hi, Thank you for your question, Adelya!

What platform do you use? What computer do you use?
1. Mac machine, web version: cmd + click or shift + click to select multiple tasks, right click to see 'Delete', click it.
2. Mac machine, mac version: the same as above.
3. Windows machine, web version: ctrl + click or shift + click to select multiple tasks, right click to see 'Delete', click it.
4. Windows machine, Windows version: the same as above.
5. iPhone version: the feature will be added soon.
6. Android version V4.4.9: long click a task in a task list, click to select more, then click '...' at upper right to see 'Delete'.
7. Android version new beta test version: the feature will be added soon.

If any more questions, please feel free to tell us.
Have a nice day!